A nurse is collecting data from a client who has a sodium level of 128 mEq/L. Which of the following manifestations should the nurse expect?

Rationale: A. Hyporeflexia is not a typical finding in hyponatremia; neuromuscular symptoms like muscle cramps and weakness are more common. B. Constipation is more often associated with hypercalcemia or dehydration, not hyponatremia. C. Headache is a common early sign of hyponatremia due to cerebral edema from water shifting into brain cells. D. Increased appetite is not associated with hyponatremia; nausea and anorexia are more likely.